Is this a DPF burnoff happening or some other fault

mayoman1973

Once or twice during the hot summer I noticed fan coming on after I stopped the car ( skoda superb mark III 2016, 2L )
I put it down to the hot weather perhaps or maybe a DPF burnoff was in the process when I stopped the car.
It hasn't happened again until last weekend when I come back to find my car battery flat. Dead.  Another thing I noticed was fuel gauge was well into the red but the fuel light was not on when I parked up as I would have noticed it. 
Did a DPF burnoff happen while I was away?  The parking attendant told me that he heard the fan going flat out for near 2 hrs,  really really loud.  This is what I noticed in summer time when it happened.  Fan was like a helicopter.  I took car to main Skoda dealer about a month ago but no errors logged or nothing to indicate there was any problem.  So I am tryig to find what may be wrong.  Does a DPF burn off consume oil, fuel or both?  It defo consumes one or other of those from what I have read as it needs something to actually get the temp raised in the DPF to actually burn off the soot.
Battery is brand new.  No other issues with car apart from that.
This last incident happened after a 50mile motorway journey

Toyotafanboi

The fam running on after the car is turned off is indicative that the car was doing a DPF regeneration when the enginr was running and turning the engine off has cut the regeneration short. The fan stays running on as a regenerating DPF can be operating at hundreds of degrees Celsius, so the fan is just making sure it cools off to a safe level.

This would be fairly normal practise for a car like yours and should be nothing to worry about. There is no engine oil involved in a regeneration, diesel consumption may be slightly higher during a regeneration but there is (obviously) no fuel used after you take the key out.

The fan shouldn't run on for more than 10-15 minutes really though and should also have the intelligence to not run for so long as to flatten the battery. Was there anything else that could have discharged the battery?

All you can do is keep an eye on it really if Skoda have tested the battery and said it's ok and confirmed the DPF operation and soot content is under control.

recyclebin

I've noticed this a few times on my car too (Honda Accord). I've also seen it on other cars when they park in the car park at work. I thought it was either the DPF or something to do with the aircon. Fan goes off after a few minutes.

mayoman1973

No,  there was nothing else that could have flattened the battery.  Last time this happened I was at home so let it run to see how long it would run for.  Fan just kept going to the point where when I tried to start the car it wouldnt turn over till I charged the battery.   When I say fan running I can't emphasize enough how loud the fan is.  From inside the house, 20m away you can hear the fan going.  And fan did not turn off until the battery was dead and could no longer power it.  From what I've read a DPF wouldn't last any longer than 10 or 20 min so does this point the finger away from it beinig DPF regen related?

ION08

It could be a dodgy Fan relay nothing to do with DPF.

Had it happen on an old Audi of mine.

Switched engine off, fan would come on full blast and stay on until battery was drained.


https://www.youtube.com/watch?v=ScrxYan07CY

mayoman1973

Does the stat for the fan include the relay component or is the temp sensor and relay switch two seperate components?